Air-pump



R. lWARNOCK.

AIR PUMP.

APPLICATION FILED NOV. I?. 1916. 1,396,079. Patented Nov. 8, 1921 2 SHEETS-SHEET l.

R. WARNOCK.

AIR PUMP.

APPLICATION FILED NOV. I7, 1916.

Panted Nov. 8, 1921.

2 SHEETS-SHEET 2- \\\\\\\\\l mwww/ ,hf INI/faro Arm/mfr UNITED STATES` PATENT OFFICE.

ROBERT WARNOCK, OF VBL()OllIFlIEL3), NEW JERSEY, ASSIGNORVTO EMPIRE CREAM SAEPARATOR COMPANY, `OF BLOOMFIELD, NEW JERSEY, A CORPORATION OF NEW JERSEY.

. AIR-PUMP.

1396079 VSpeeiiiucation of Letters Patent. Patented N0V 8, 1921. Application filed November 1'?, 1916. Serial No. 131,832. To all whom t may concern.' air, it is impossible to maintain an excess of Be it knownv that I, ROBERT WARNOCK, a oil in the pump as it is being continually carcitizen of the United States, residing in ried off and wasted. Moreover, the dischar e Bloomfield, county of Essex, and State of of the oil from the pump is objectionable and New Jersey, have invented certain new and therefore tends to encourage the operator useful Improvements in Air-Pumps, of to utilize an inadequate su which the following is a specification. the objectionable discharge of the same. 60

This invention relates to pumps for han- `n the accompanying drawings which form dling fluids, such as air or other gases or a part of this specification, I have illustratvapors, and is particularly applicable to ed one preferred embodiment of my invenvacuum or suction pumps, although the intionin order to exhibit the principle of the vention may insomecases be applied to com'- same and the best mode now known to me 65 pression pumps. Y Y n n pumps of the character referred to, as be understood as thereby limiting myself to heretofore constructed, it has been common the details of construction set forth. to form both the inlet and outlet ports in the In these drawings, Figure l is a vertical cylinder head, which also carried the in let sectional View through the pump cylinder, and outlet valves. Quite complicated cyllnpiston and upper part of the crank case. der head constructions have been the result. Fig. 2 is a horizontal section 0n line H II In some cases this practice has been depart of Fig. 1. Fig. 3 is a horizontal section on ed from to the extentof putting one of the line ,III`III of Fig. l. ig. 4 is a horivalves in Vthe head and the other in the piszontal section on line IV`IV of Fig. l. ton, but this arrangement involves the use Referring to the drawings in detail, the of special constructions for both the cylinder vnumeral l designates the crank case of the and. piston. pump, the upper part onlyl of which is VIn accordance with the present invention, shown. ,'As will be understood this crank provide that both the inlet andvexliaust case containsV the bearings for the crank valves shall be carried on the piston, thereby shaft (not shown) and is formed to provide entirely Glmll'illg allylleChaIlSm' 011 the in its lower part an oil reservoir from which cylinder head. The invention` of the presthe oilvis fed by the splashing of the crank ent application vis also particularly welly and connecting rod into the same in a welladapted to carrying out the broad invention understood manner. Mounted on the crank Y set forth 1n my application, Serial ,No.f case is the cylinder 2 in which reciprocates 105,014, filed June 21st, 1916, 1n accordanceA the piston 8, the latter being connected to with which I provide for the` exhaust tak'- the crank by the connecting rod 4. The ing place through the crank case of the cylinder 2 is provided with a suitable head pump, S0 as ,t0 utilize the Crank CaSe. aS a such as the simple plate 5 secured in position 90 muffler and to provide for the recovery of y the cap screws 6. If desired, the .head any lubricantcarried off in the exhaust. VBy and cylinder may be formed integral. At a carrying the exhaust into the crank case, suitable point between the ends of the cylinsuch lubricant is returned to the oil reservoir der, an enlargement 7 is formed thereon thereof, so that it may be used over again. which contains an annular inlet chamber 8 95 Objectionable discharge of oil from the having a suitable opening or openinvs 9 pump is prevented and it is possi-ble to utilize into which the inlet pipe or pipes (not an excess of lubricant, so as to insure ade-V shown) lead. A number of inlet ports l0 quate lubrication atall times. For these are formed in the cylinder wall and 'comreasons the pump is particularly adapted municate with the chamber 8. for use by unskilled operators as the quantity The piston 3 has an annular depression ll of oil supplied to the pump need not be acformed in its periphery between the ends curately gaged, it being only necessary to see thereof and adapted to communicate with that a considerable quantity is maintained at the chamber 8 through the ports 10 in all all times in the crank case. With pumps in positions of the piston. The depression 11 105 which the discharge takes place in the open also communicates through the passages l2 v Jassages are closedbv a formed .in the plate.

Y its seat by springs 3() Vand has an opening at its upper end, which is closed by the plate or piston head 15, which is secured to the piston in any suitable manner Aas by means of the screws 16 engaging lugs 17 projecting inwardly from the piston wall. An inlet valve in the shape of a flat ring 17 of thin' metal is adapted to seat upon the valve seatY 14 and close the ports 13 and recess 18 formed in the underside of the plate Springs 19 may,if desired, be provided for urging the valve upon its seat, these springs being retained in pockets 2O The plate 15 also has formed through it the discharge passages 25 by which the fluid in the cylinder above the piston is discharged through the hollow piston' intothe crank case. These "discharge flat ring valve 26 adapted to seat upwardly against the valve seat 27 formed on the' underside of the plate, the valve being retained in position by a retaining spider 28 secured to the plate in any suitable manner as by means of a screw 29. -The valve. is normally urged against carried in pockets 31 in the spider. rlhe cylindrical portion 32 of the spider forms a guide and centering device for the valve 26. i

With the construction shown, it will be seen that on the down stroke of the 'piston a reduction in pressure will beV produced `in the cylinder above the piston, which will cause the discharge valve 26 to close upon its seat 'and at the same time air will be drawn in through the openings 9 into the chamber 8 and will pass throughy the ports 10 into the depression 11, through the passages 12 and ports 13,. and so into the cylinder. On the upl` stroke of the piston, the pressure created in the cylinder will cause the valve 17 to close and the valve 26 to open, thus discharging the air through the piston in the crank case.

lWhile Ihave shown in the drawings and described in detail, but one preferred embodiment of my invention, this is to be understood merely as illustrative of the principle ofthe invention and I do not, therefore, intend to limit myself to this construction, but intend to cover my invention 551 broadly in whatever form 1t may be embodied.

, Having thus claim:

1. V1n apparatus of the character described,

described my invention, -I

y)assaue of fluid is retained in position 1n aV adapted to seat on cating in said cylinder and having an elongated depression in the surface communicating at all' times with .said inlet port, apassage-'Way in said piston communicating .with said depression, an inlet valve governing the through said passage-way and an exhaust valve on said piston.

2. In apparatus of the character described,

the combination of a 'cylinder having an inlet port in the side wall thereof between its ends, a piston reciprocating in said cylinder and having an elongated depression communicating with said port, a passage-way in said piston connected with said sion, an ilet valve carried by said piston and adapted to close said passage-way, `a discharge opening in said piston adapted to permit the passage of air from one side to the vother thereof adapted to close Vsaid discharge opening.y 3. 1n apparatus of the character described, the combination of a cylinder, an inlet port formed in the side wall thereof between the ends of the cylinder, 'a piston "reciprocating in said cylinder and having an'elongated depression adapted to communicate at all times with said port, a valve seat on the end of said piston, passage-ways in said piston connecting said depression seat, anannular valve adapted to close said passage-ways, a'plate attached to the end of said piston and adapted to retain said annular4 valve inV position, said plate havinga discharge port formed therethrough and a discharge valveadapted Ato close said dischargIe port. Y

4. n apparatus of thecharacter described, the combination of a cylinder having an annular chamber formed around the outside chamber, a hollow'piston reciprocating in depresand a discharge valve with said valve said cylinder and having an annular depression between its ends adapted ktocommunicate at all times with the port in the cylinder wall', said piston having a'valve seat at one end thereof, passage-ways connecting said depression with said valve seat, a valve said valveY seatk and close said passage-ways, a plate attached to the end of the piston and adapted to retain said valve in position, a vdischarge port in said plate and adischarge valve adapted to close said Vport.

ROBERTy WARNOCK. 

